3981786 has 8 divisors (see below), whose sum is σ = 7963584. Its totient is φ = 1327260.

The previous prime is 3981767. The next prime is 3981821. The reversal of 3981786 is 6871893.

It is a sphenic number, since it is the product of 3 distinct primes.

3981786 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331810 + ... + 331821.

It is an arithmetic number, because the mean of its divisors is an integer number (995448).

Almost surely, 2^3981786 is an apocalyptic number.

3981786 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3981786 is a wasteful number, since it uses less digits than its factorization.

3981786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663636.

The product of its digits is 72576, while the sum is 42.

The square root of 3981786 is about 1995.4413045740. The cubic root of 3981786 is about 158.4987975375.

It can be divided in two parts, 39817 and 86, that added together give a triangular number (39903 = T₂₈₂).

The spelling of 3981786 in words is "three million, nine hundred eighty-one thousand, seven hundred eighty-six".